Check for non-final field in the face of const constructors.

tests/co19/co19-dart2js.status

Index: tests/co19/co19-dart2js.status
diff --git a/tests/co19/co19-dart2js.status b/tests/co19/co19-dart2js.status
index 0677e7a801877ba5cb7802595eb195c35f8c6ba2..6041a1044bb1cead77095804a7fd11eec71f2a29 100644
--- a/tests/co19/co19-dart2js.status
+++ b/tests/co19/co19-dart2js.status
@@ -303,7 +303,6 @@ Language/07_Classes/07_Classes_A02_t04: Fail # Checks that it is a compile-time
 Language/07_Classes/07_Classes_A02_t11: Fail # Checks that it is a compile-time error if a static final variable declaration does not include explicit initializer.
 Language/07_Classes/07_Classes_A11_t01: Fail # Checks that a class name cannot be used as a name of a member variable.
 Language/07_Classes/07_Classes_A11_t03: Fail # Checks that a class name cannot be used as a name of a static variable.
-Language/07_Classes/6_Constructors/3_Constant_Constructors_A03_t01: Fail # Checks that a compile-time error is produced when a class with constant  constructor also declares a non-final instance variable.
 Language/12_Expressions/01_Constants_A20_t03: Fail # Checks that an identifier expression that denotes a type parameter  can not be assigned to a constant variable.
 Language/12_Expressions/05_Strings/1_String_Interpolation_A01_t09: Fail # Checks that it is a compile-time error if a string interpolation construct does not start with IDENTIFIER_NO_DOLLAR or opening brace.
 Language/12_Expressions/05_Strings_A02_t46: Fail # Checks that multi-line strings that contain characters and sequences prohibited by this grammar, cause compile-time errors.